Added IO example from chapter 7 of Real World Haskell#155

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mperry merged 3 commits intofunctionaljava:masterfrom

mperry:realworld

Jun 15, 2015

Commits on Jun 13, 2015

Implemented real world haskell IO (chapter 7) demonstration, implementing
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Commits on Jun 14, 2015

Added IOFunctions.interactWhile and some sequence and traverse methods for Stream to support interactive IO from stdin to stdout
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Added example comment for ch 7 of real world haskell
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